Cartridge Aerator Pump1000 GPH - 90Johnson Pump cartridge aerator pumps offer the ease of convenience and years of reliable service. Improved design with easy-to-install Dura-Port discharge port. Smaller profiles to fit in more confined spaces. Easy to change motor cartridge.Features:. Capacities 500, 750, 1000 and 1250 GPH. Available in two different intake configurations: straight or 90. Compact, easily replaceable all-in-one motor/impeller unit. No tools needed for maintenance. Extremely energy efficient. Water-cooled motor for long service intervals. Improved design with easy-to-install Dura-Port discharge ports (straight and a 90 smooth elbow included) eliminate stress cracking caused by over-tightened hose clamps. Meets the international standard, ISO 8849 marine